1BLK_ADD_REQUEST_PAYL(9)          Block Devices         BLK_ADD_REQUEST_PAYL(9)
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NAME

6       blk_add_request_payload - add a payload to a request
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SYNOPSIS

9       void blk_add_request_payload(struct request * rq, struct page * page,
10                                    int offset, unsigned int len);
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ARGUMENTS

13       rq
14           request to update
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16       page
17           page backing the payload
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19       offset
20           offset in page
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22       len
23           length of the payload.
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DESCRIPTION

26       This allows to later add a payload to an already submitted request by a
27       block driver. The driver needs to take care of freeing the payload
28       itself.
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30       Note that this is a quite horrible hack and nothing but handling of
31       discard requests should ever use it.
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34Kernel Hackers Manual 3.10         June 2019           BLK_ADD_REQUEST_PAYL(9)
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